81394284029 has 2 divisors, whose sum is σ = 81394284030. Its totient is φ = 81394284028.

The previous prime is 81394284007. The next prime is 81394284031. The reversal of 81394284029 is 92048249318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73550524804 + 7843759225 = 271202^2 + 88565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81394284029 is a prime.

Together with 81394284031, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81394280029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40697142014 + 40697142015.

It is an arithmetic number, because the mean of its divisors is an integer number (40697142015).

Almost surely, 2^81394284029 is an apocalyptic number.

It is an amenable number.

81394284029 is a deficient number, since it is larger than the sum of its proper divisors (1).

81394284029 is an equidigital number, since it uses as much as digits as its factorization.

81394284029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 81394284029 in words is "eighty-one billion, three hundred ninety-four million, two hundred eighty-four thousand, twenty-nine".